Fix image_viewer (#5571)
Fix image_viewer (#5571)

Many EXR files may contain negative values, we don't want to output
those to our color buffer.
google/filament,google/filament,google/filament,google/filament,google/filament,google/filament,google/filament,google/filament,google/filament,google/filament,google/filament,google/filament